Compensating device for cinematographs



Oct. 2 1923.

W. BAUERSFELD COMPENSATING DEVICE FOR GINEMATOGHAPHS Filed. June 14.1922 --To all whom it may concern:

Patented Oct. 2, 1923.

UNITED STATI-:s

PATENT GFFl-CE.

`WALTH'EB.` BAuEasrnLn,` or JENA, GERMANY, AssIGNon To THE man or CARLzE1ss,.

f or JENA, esExANY.

COHPHSATING DEVICE FOB CINEHATOGRAPHS.

Application tied June 1-11F1922.v Serial No. 568,297.

Be it known that I, VALTHER a citizen of the German Empire, and residingat Jena, Germany, have invented a new and useful -Compensating Devicefor Cine- Ymatographs (for which I have tiled an application in-GermanyJune 27, 1921), of which the following is a specification.

The present invention relates to a compensatingdevicc lforcinematographs conftaining 'an endless series of lenses, which affordoptical compensation of thetravelling of the image and are movablydisposed in a plane perpendicular to their optical axes in a slit,having a rectilinear part, and which are further disposed in suchamanner that their mounts, on traversingthe rectilinear part of the slit,come .in contact withv each other. In contrast to theseries of lenses ofsuch kind as shown, e. g. in Fig. V of the English.

patent specification 1620.2 of the vcar 1915, according to the inventionthe lenses are 4joined inthe slit in series Without anyconnexionwhatever, whilst for actuating the 'lenses there serves asystem of wheels (which mayconsist of a single wheel) and which Wheelsengage in the lens mounts. Apart from the ,simplicity of the newstructure, in the presentl case by making the diameters of the lensmounts exactly agree withy each other, by exactlyccntering the lenses intheir mounts as well as by exactly making lthe plane surfaces of therectilinear part of the slit it is possible to fulfil in a particularlyhigh degree thel condition that the optical axes of the lenses duringtheir passage through the field or rays of the cinematograph move in aplane in such a manner that they remain exactly equidistant from eachother. If an arrangement has been made by whichthe lenses in therectilinear part of the slit are elastically pressed against the one`slit surface,it is substantially `only of importance that this one slitsurface isv BAUERSEELD, H

a. luniform motion, the wheel system actuating the lenses is suitably sodevised that there only coact with the wheel system the lens mountslying in the rectilinear part of the slit at anyone time. With a view toimpart to the lenses a guide by'which they are prevented from laterallyslipping out of the slit and simultaneously from becoming askew, everysecond lens mount is provided with a neck ring which engages on the olievhand in corresponding grooves of the adjoining mounts 'and on the otherhand in a groove inthe one slit-wall surrounding the entire slit.

The annexed drawingr shows a constructional example of the invention;Fig. 1 Shows an elevation, whilst Figs. 2 and 3 are.

. sections on the lines 2 2 and 3 3 of Fig. 1.

Two plate-shaped bodies a1 and a2 are by means of bands a3 rigidlyconnected in such a way that between them there is formed a slit b whichis close in itself and which contains a rectilinear part b", Whilst asfor the rest its shape is immaterial. In the slitfb there are looselyjoined in series 24 lenses c, all mounts c1 of which have a diameter eual to the width u ofthe slit. The lengt s of the mounts differ from oneanother, viz, the one half of the mounts has a length equal to the depthv of the slit b and is disposed in the-latter in such a way that bothends of the mounts terminate with the slit, whilst the other half of themounts has a length @+23 and is disposed in the slit in such a Way thatthe mounts project on either side of the slit by the amount s.vShort'and long mounts appear alternately. With a view to protect themounts from lateral displacements relative to the slit and from becomingaskew, every "second mount is provided with a neck ring c2 engaging incorresponding annular grooves 0 of the adjoining mounts. All neck ringsO2 arel guided in a groove a* of each slit-wall, surrounding the entireslit. The lenses are moved in the slit b in the arrow-direction by twotoothed wheels d1, disposed on a common shaft d and coacting with thelong mounts. The shaft d is rotatable in the arrow-direction andsupported on the body a1 in such a manner that the toothed Wheels d* areonly coacting with. those mounts which lie at any one time in therectilinear part bo of the slit b. The above described device is assumedto be fitted to a cinematograph, affording optical compensation of thetravelling of the image, in such a way that the rectilinear part b ofthe slit faces the film F, i. e., that the direction of motion of thelenses in this part 6 of the slit agrees with the direction of motion ofthe film.

I claim:

1. In a compensating device for cinematographs an endless series oflenses affording optical compensation of the travelling of the image,the said lenses being movable in a plane perpendicular to their opticalaxes, a body having a slit, a part of the said slit being rectilinear,the said lenses being without relative connexion and their mounts, ontraversing the said rectilinear part, being contiguous to each other,and a system of wheels' actuating the lenses and engaging in the lensmounts.

2. In a compensating device for cinematographs an endless series oflenses affording optical compensation of the travelling of the image,the said lenses being movable in a plane perpendicular to their opticalaxes, a body having a slit, a part-of the said slit being rectilinearand 'being filled up with lenses for its ull length, the said lensesbeing withoutrelative connexion and their mounts, on traversing the saidrectilinear part, being contiguous to each other, and a system of wheelsactuating the lenses and engaging in the lens mounts.

3. In a compensating device for cinematographs an endless series oflenses af ording optical compensation of the travelling of the image,the said lenses being movable in a plane perpendicular to their o ticalaxes, a body having a slit, a part o the. said slit being rectilinear,the

said lenses being without relative connexion.

and their mounts, on traversing the said rectilinear part, beingcontiguous to each other, and a system of wheels actuating the lensesand each of the said wheels only ooactin with every second lens mount.

4. n a compensating device for cinematographs an endless series oflenses affording optical compensation of the travelling of the image,the said lenses being movable in a plane perpendicular to their opticalaxes, a body havin a slit, a part of the said slit being rectiinear, thesaid lenses being without relative connexion and their mounts, ontraversing the said rectilinear part, being contiguous to each other,and a system of wheels actuating the lenses and only the lens mounts,lying in the said rectilinear part at any oneftime, coacting with thesaid wheel system actuating the lenses. Y

5. In a compensating device for cinematographs an endle series of lensesaffording optical compensation of the travelling of the image, the saidlenses being movable in a plane perpendicular to their optical axes, abody having a slit, a part of the said slit beingrectilinear, the saidlenses being without relative connexion and their mounts, on traversingthe said rectilinear part, being contiguous to .each other, every secondlens mount being provided with a neck ring which engages on the onevhand in corresponding grooves of the adjoining lens mounts and on theother hand in a oove in the one slit-wall, surwounding t e entire slit,and a system of f wheels actuating the lenses and engaging in the lensmounts. l

WALTHER BAUERSFELD;

Witnesses PAUL KRGEB, Fnrrz SANDER..

